Turbine rotor



Aug. 2o, 1940.

R. PIKROO N TURBINE ROTOR Filed Jan. 31, 1939 INVENTOR' Rumour? Knees.

VRM

ATTORNEY} WITNESSES: L4. 747W Patented Au 20, 1940 TURBINE 1:01:01;

Reinout 12.1mm, Swarthmore, Pa., assignor to Westinghouse Electric & Manufacturing Company, East Pittr'burgh, Pa.,- a corporation of Pennsylvania Application January 31, 1939, Serial No. 253,750

. 2 Claims.

\ My invention relates to steam' turbines of the type wherein the rotor is made hollow for the prevent direct contact, with the rotor proper, of

water condensing from the, steam and which 15 would otherwise set up unbalance and distortion of the massive rotor with serious unbalance and vibration.

These and other objects are effected by my' invention as will be apparent from the following go description and claims taken inconnection with the accompanying drawing, forming a part of this application, in which the'figure is a longitudinal sectional view of a turbine embodying my improvement.

5 Referring to the drawing more in detail, there is shown a casing embodying, for example, an in-- 30 I3 is supported for rotation within the casing, structure by means of bearings l4, l4 carried by the end or exhaust casing sections l2, l2. As shown, the rotor includes end members l5, l5 spigoted within and secured to opp site ends of the intermediate portion 16 having a hollow or bore IT. l

The blading of the turbine illustrated comprises a high-pressure section, at l8, and axiallyaligned, low-pressure sections, at l9 and 20, the high-pressure section including impulse blading 2| and reaction blading 22 and the low-pressure sections, at I 9 and 20, including reaction blading, at 23 and 24, respectively.

Steamsupplied to the turbine passes in series through the impulse blading 2| and the reaction blading 22 of. the high-pressure section, at l8, and steam exhausted from the latter passes in parallel through the low-pressure sections, at i9 and 20, the steam entering the exhaust space, 50 at 25, being directly supplied to the low-pressure section, at l9, and being supplied to the low-pressure section, at 20, through the bore I! of the intermediaterotor portion IS, the latter having'inlet openings 26 communicating with the space, at 25, and outlet openings 21 communicating with the space, at 28, which sppplies steam to the low-pressure section, at 20.

With a turbine of this type, as the rotor and the hollow portion thereof may be of considerable length and as opportunity exists for the condensation of water from the steam passing through the hollow portion of the rotor, accumulations of water may occur therein and cause unbalance and serious rotor distortion'resulting in violent vibration.

' In accordance with the present invention, the hollow portion of the rotor is provided with a thin-walledmetallic, co-axial sleeve 30 carried "by end rings 3! and fixed within the bore H. The liner or tubular member an is spaced from ,the bore wall with the result that water accumulations act'thereon and not on the rotor proper, whereby distortions of the latter, and consequent vibrations are avoided. Preferably, the tubular member diverges in the direction of flow to facilitate the passage of water condensing from the steam in the direction of flow. The anchor or end rings 3| and 32 provide for support of the liner or tube with requisite divergence of the latter, but, as the tube or diffuser has a relatively thin wall, has relatively small mass, and is spaced from the interior of therotor, it cannot transmit any appreciable distorting forces to the rotor proper even though it should be unevenely heat ed by the fluid passing therethrough or should be distorted by water accumulations.

-While I have shown the improvement applied to the hollow portion of the relatively long rotor of a double-flow steam turbine, it will be apparent that it may be applied to any steam tur- V bine, rotorwhich is 'made hollow for the passage of steam, the only requirement being that, instead of having the steam pass directly in contact with the bore wall of the hollow portion, a ;liner or diifuser shall be provided for thebore, to prevent accumulations of water in the rotor suflicient to develop disturbing forces causing distortion and vibration; I

While-I have shown my'invention' in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes and modifications without departing from the spirit thereof,.and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

What I claim is: 1. In a steam turbine, a casing, a rotor, highand low-pressure blading sections carried by the casing and by the rotor; said rotor having a vhollow portion hounded by the .high pressure hlading. section and having openings communicatingwith the hollow portion to provide a passage for conducting steam from the discharge end of' and comprising a thin metallic sleeve bounding the steam flow passage of the hollow portion;

said'sleeve being spaced ,from the interior'wall [of the hollow portion, extending'for substantially the full length of the high-pressure blading section,,' an d having its ends fastened to' the g interior hollow portion.

2.-Ina steam-turbine, a high-pressure blading section; a pair of low-pressure blading sections aligned axially with the high-pressure blading section; a casing carrying'the stationary blading of said sections; a rotor carrying moving blading of said sections and having the portion thereof carrying the high-pressure moving blading provided with an axial bore; said casing and rotor providing a steam space with which the exhaust end of the high-pressure section and the inlet end of one of the low-pressure sections directly communicate; said rotor having openings afl'ording communication of said space with the bore and openings affording communication of, the bore with the inlet end of the last-named low-pressure section; and means for preventing distortion and unbalanceof the rotor by condensate collecting from the steam on the interior wall'of the bore and comprising a thin metallic sleeve bounding the steam flow passage of the bore; said sleeve being spaced from the interior wallof the bore extending for substantially the full length of the high-pressure blading section,

and havingits ends fastenedto'the interior wall of the bore.

t REINOUT P. KROON. 

